Standard Products ACT4468D Dual Transceivers for MIL-STD-1553, MIL-STD-1760 & SAE-AS15531 www.aeroflex.com/Avionics February 18, 2005 FEATURES ❑ ❑ ❑ ❑ ❑ ❑ ❑ ❑ Small size, light weight and low power dissipation dual transceiver Single +5V DC power supply operation Outstanding MIL-STD-1553 / MIL-STD-1760 / SAE-AS15531 performance Monolithic construction Current source output Designed for commercial, industrial and aerospace applications MIL-PRF-38534 compliant devices available Aeroflex-Plainview is a Class H & K MIL-PRF-38534 manufacturer GENERAL DESCRIPTION The Aeroflex-Plainview ACT4468D is the next generation monolithic transceiver design which provides full compliance with MIL-STD-1553/1760 and meets SAE-AS15531 requirements in the smallest packages with the lowest standby power consumption and one power supply operation. The dual channel Model ACT4468D perform the front-end analog function of inputting and outputting data through a transformer to a MIL-STD-1553/1760 data bus. Design of these transceivers reflects particular attention to active filter performance. This results in low bit and word error rate with superior waveform purity and minimal zero crossover distortion. Efficient transmitter electrical and thermal design provides low internal power dissipation and heat rise at high as well as low duty cycles. Each channel of the dual transceiver is completely separate from the other and fully independent. This includes power leads as well as signal lines. Hence, each channel may be connected to a different data bus with no interaction. TRANSMITTER The transmitter section accepts bi-phase TTL data at the input and when coupled to the data bus with a 1:2.5 ratio transformer the data bus signal is typically 7.5 Volts P-P at Point A-A' (See Figure 5). When both DATA and DATA inputs are held low, the transmitter output becomes a high impedance and is '' removed'' from the line. In addition, an overriding '' INHIBIT" input provides for the removal of the transmitter output from the line. A logic '' 1'' applied to the '' INHIBIT'' takes priority over the condition of the data inputs and disables the transmitter (See Figure 1 Transmitter Logic Waveform). The transceiver utilizes an active filter to suppress harmonics above 1MHz. The Transmitter may be safely operated at 100% duty cycle for an indefinite period into a short circuited 1553 bus. RECEIVER The Receiver section accepts bi-phase differential data at the input and produces two TTL signals at the output. The outputs are DATA and DATA, and represent positive and negative excursions of the input beyond a pre-determined threshold (See Receiver Logic Waveform. Figure 2). The pre-set internal thresholds will detect data bus signals exceeding 1.150 Volts P-P and reject signals less than 0.6 volts P-P when used with a 1:2.5 turns ratio transformer (See Figure 5 for transformer data and typical connection). SCD4468D Rev E TX DATA IN TX/RX DRIVER TX DATA IN ACTIVE FILTER OUTPUT STAGE REFERENCE COMP. ACTIVE FILTER COMP. TX/RX TX INHIBIT +5 V RX DATA OUT GND STROBE INPUT AMPLIFIER RX DATA OUT BLOCK DIAGRAM (WITHOUT TRANSFORMER), 1/2 OF UNIT SHOWN DATA IN DATA IN INHIBIT LINE TO LINE OUTPUT NOTES: DATA and DATA inputs must be complementary waveforms or 50% duty cycle average, with no delays between them, and must be in the same state during off times (both high or low). FIGURE 1 – TRANSMITTER LOGIC WAVEFORMS IDEALIZED LINE TO LINE INPUT DATA OUT DATA OUT Note overlap NOTE: Waveforms shown are for normally low devices. For normally high receiver output level devices, the receiver outputs are swapped as shown by the dashed lines. FIGURE 2 – RECEIVER LOGIC WAVEFORMS IDEALIZED SCD4468D Rev E 2 ABSOLUTE MAXIMUM RATINGS Operating Case Temperature -55°C to +125°C Storage Case Temperature -65°C to +150°C Positive Power Supply Voltage -0.3 VDC to +7.0 VDC Receiver Differential Input ±10V Receiver Input Voltage (Common Mode) ±5V Driver Peak Output Current 650 mA Total Package Power Dissipation over the Full Operating Case Temperature Range 2 Watts (Note: Normal operation conditions require one transmitter on and the other off at any given time) Maximum junction to Case Temperature 10°C Thermal resistance – Junction to Case 5°C/W ELECTRICAL CHARACTERISTICS – DRIVER SECTION INPUT CHARACTERISTICS, TX DATA IN OR TX DATA IN Parameter Condition Symbol Min Typ Max Unit "0" Input Current VIN = 0.4V IILD - -0.2 -0.4 mA "1" Input Current VIN = 2.7V IIHD - 1 40 µA "0" Input Voltage VILD - - 0.7 V "1" Input Voltage VIHD 2.0 - - V INHIBIT CHARACTERISTICS "0" Input Current VIN = 0.4V IILI - -0.1 -0.2 mA "1" Input Current VIN = 2.7V IIHI - 1.0 40 µA "0" Input Voltage VILI - - 0.7 V "1" Input Voltage VIHI 2 - - V Delay from TX inhibit, (0➝1) to inhibited output tDXOFF - 200 300 nS Delay from TX inhibit, (1➝0) to active output tDXON - 80 150 nS Differential Output Noise, inhibit mode VNOI - 2 10 mVp-p ZOI 2K - - Ω VO 6.5 7.5 8.0 Vp-p tr 100 170 300 nS VOS - - ±90 mVpeak tDTX - 100 200 nS Differential Output Impedance (inhibited) Note 1 Note 1. Power ON/OFF, measured from 75KHz to 1MHz at Point A-A. See Figure 5. OUTPUT CHARACTERISTICS Differential output level RL = 35Ω Rise and fall times (10% to 90% of Vp-p output) Output Offset at point A-A' on Figure 5, 2.5µS after midpoint crossing of the parity bit of the last word of a 660µS message RL = 35Ω Delay from 50% point of TX DATA or TX DATA input to zero crossing of differential signal SCD4468D Rev E 3 ELECTRICAL CHARACTERISTICS – RECEIVER SECTION Parameter Condition Symbol Min Typ Max Unit VIDR - - 20 Vpk CMRR 45 - - dB Differential Voltage Range, Figure 4 Point P-P’ Common Mode Rejection Ratio (Note 3) STROBE CHARACTERISTICS (LOGIC "0" INHIBITS OUTPUT) "0" Input Current VS = 0.4V IIL - -0.2 -0.4 mA "1" Input Current VS = 2.7V IIH - 1 +40 µA "0" Input Voltage VIL - - 0.7 V "1" Input Voltage VIH 2.0 - - V Strobe Delay (Turn-on) tSD(ON) - 40 100 nS Strobe Delay (Turn-off) tSD(OFF) - 60 100 nS VTH 0.60 0.8 1.15 Vp-p THRESHOLD CHARACTERISTICS (SINEWAVE INPUT ) Input Threshold Voltage (Referred to the bus) 100KHz1MHz OUTPUT CHARACTERISTICS, RX DATA AND RX DATA "1" State IOH = -0.4 mA VOH 2.5 3.7 - V "0" State IOL = 4 mA VOL - 0.3 0.5 V tDRX - 250 400 nS Delay, (average)from differential input zero crossings to RX DATA and RX DATA output 50% points POWER DATA MAXIMUM CURRENTS, PER CHANNEL (+5V) Duty Cycle Typ Max Transmitter Standby 20 mA 30 mA 25% duty cycle 155 mA 185 mA 50% duty cycle 290 mA 335 mA 100% duty cycle 560 mA 650 mA POWER SUPPLY VOLTAGE +V 4.75 to 5.5 Volts Note 2. VCC = 5 Volts ±0.1 V, for all measurements unless otherwise specified. Note 3. Specifications apply over the case temperature range of -55°C to +125°C unless otherwise specfied. Note 4. All typical values are measured at +25°C. SCD4468D Rev E 4 LAST BIT tf* 90% Magnified View OUTPUT OFFSET* 6.5V P-P MIN 8.0V P-P MAX 0 Volts 0 volts OUTPUT OFFSET* 10% 2.5 µsec tr * *Offset measured at point A-A’ in Figure 5 * Rise and fall times measured at point A-A’ in Figure 5 FIGURE 3 – TRANSMITTER (TX) OUTPUT WAVEFORM FIGURE 4 – TRANSMITTER (TX) OUTPUT OFFSET POWER DISSIPATION MILLIWATTS 1600 1400 70Ω 70Ω 1200 Maximum 1000 ZO 800 Typical 600 TX DATA OUT 52.5Ω 1:2.5 P B A 400 DUT 200 0 0 10 20 30 40 50 60 70 80 90 100 TX DATA OUT Center Tap P' 1:1.77 for stub coupling A' B' 52.5Ω DUTY CYCLE – PERCENT RX DATA IN Note: Vcc = +5 Volts, VBUS (point A-A') at 7.5 Volts P-P RX DATA IN FIGURE 5 – POWER DISSIPATION VS. DUTY CYCLE FIGURE 6 – TYPICAL TRANSFORMER CONNECTION (Total hybrid with one channel transmitting and the other not powered) SCD4468D Rev E 5 PACKAGE OUTLINE DRAWINGS "FLAT Package" .990 1.010 .890 .910 .100 BSC ESD .008 .012 Triangle 20 11 .290 .310 10 .400 .016 .020 .050 .075 .098 .122 "DIP Package" .990 1.010 20 11 .287 .303 .300 10 ESD .008 .012 Triangle .025 .045 .150 .MIN .098 .122 .100 BSC .05 .016 .020 .890 .910 Notes 1. Dimensions shown are in inches SCD4468D Rev E 6 CONFIGURATIONS AND ORDERING INFORMATION Model No. Receiver Data level Case ACT4468D Normally Low DIP Package ACT4468DF Normally Low Flat Package ACT4468DI Normally High DIP Package ACT4468DFI Normally High Flat Package Configuration Dual PIN # vs FUNCTION TABLE Pin Function Pin Function 1 +5VDC A 11 RX DATA OUT B 2 TX/RX A 12 RX DATA OUT B 3 TX/RX A 13 TX INHIBIT B 4 STROBE A 14 TX DATA IN B 5 GROUND A 15 TX DATA IN B 6 +5VDC B 16 RX DATA OUT A 7 TX/RX B 17 RX DATA OUT A 8 TX/RX B 18 TX INHIBIT A 9 STROBE B 19 TX DATA IN A 10 GROUND B 20 TX DATA IN A PLAINVIEW, NEW YORK Toll Free: 800-THE-1553 Fax: 516-694-6715 INTERNATIONAL Tel: 805-778-9229 Fax: 805-778-1980 NORTHEAST Tel: 603-888-3975 Fax: 603-888-4585 SE AND MID-ATLANTIC Tel: 321-951-4164 Fax: 321-951-4254 WEST COAST Tel: 949-362-2260 Fax: 949-362-2266 CENTRAL Tel: 719-594-8017 Fax: 719-594-8468 www.aeroflex.com [email protected] Aeroflex Microelectronic Solutions reserves the right to change at any time without notice the specifications, design, function, or form of its products described herein. All parameters must be validated for each customer's application by engineering. No liability is assumed as a result of use of this product. No patent licenses are implied. Our passion for performance is defined by three attributes represented by these three icons: solution-minded, performance-driven and customer-focused SCD4468D Rev E 7